/*** Routines to represent binary data in ASCII and vice-versa**** This module currently supports the following encodings:** uuencode:** each line encodes 45 bytes (except possibly the last)** First char encodes (binary) length, rest data** each char encodes 6 bits, as follows:** binary: 01234567 abcdefgh ijklmnop** ascii: 012345 67abcd efghij klmnop** ASCII encoding method is "excess-space": 000000 is encoded as ' ', etc.** short binary data is zero-extended (so the bits are always in the** right place), this does *not* reflect in the length.** base64:** Line breaks are insignificant, but lines are at most 76 chars** each char encodes 6 bits, in similar order as uucode/hqx. Encoding** is done via a table.** Short binary data is filled (in ASCII) with '='.** hqx:** File starts with introductory text, real data starts and ends** with colons.** Data consists of three similar parts: info, datafork, resourcefork.** Each part is protected (at the end) with a 16-bit crc** The binary data is run-length encoded, and then ascii-fied:** binary: 01234567 abcdefgh ijklmnop** ascii: 012345 67abcd efghij klmnop** ASCII encoding is table-driven, see the code.** Short binary data results in the runt ascii-byte being output with** the bits in the right place.**** While I was reading dozens of programs that encode or decode the formats** here (documentation? hihi:-) I have formulated Jansen's Observation:**** Programs that encode binary data in ASCII are written in** such a style that they are as unreadable as possible. Devices used** include unnecessary global variables, burying important tables** in unrelated sourcefiles, putting functions in include files,** using seemingly-descriptive variable names for different purposes,** calls to empty subroutines and a host of others.**** I have attempted to break with this tradition, but I guess that that** does make the performance sub-optimal. Oh well, too bad...**** Jack Jansen, CWI, July 1995.**** Added support for quoted-printable encoding, based on rfc 1521 et al** quoted-printable encoding specifies that non printable characters (anything** below 32 and above 126) be encoded as =XX where XX is the hexadecimal value** of the character. It also specifies some other behavior to enable 8bit data** in a mail message with little difficulty (maximum line sizes, protecting** some cases of whitespace, etc).**** Brandon Long, September 2001.*/#define PY_SSIZE_T_CLEAN#include "Python.h"#ifdef USE_ZLIB_CRC32#include "zlib.h"#endifstaticPyObject*Error;staticPyObject*Incomplete;/*** hqx lookup table, ascii->binary.*/#define RUNCHAR 0x90#define DONE 0x7F#define SKIP 0x7E#define FAIL 0x7Dstaticunsignedchartable_a2b_hqx[256]={/* ^@ ^A ^B ^C ^D ^E ^F ^G *//* 0*/FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,/* \b \t \n ^K ^L \r ^N ^O *//* 1*/FAIL,FAIL,SKIP,FAIL,FAIL,SKIP,FAIL,FAIL,/* ^P ^Q ^R ^S ^T ^U ^V ^W *//* 2*/FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,/* ^X ^Y ^Z ^[ ^\ ^] ^^ ^_ *//* 3*/FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,/* ! " # $ % & ' *//* 4*/FAIL,0x00,0x01,0x02,0x03,0x04,0x05,0x06,/* ( ) * + , - . / *//* 5*/0x07,0x08,0x09,0x0A,0x0B,0x0C,FAIL,FAIL,/* 0 1 2 3 4 5 6 7 *//* 6*/0x0D,0x0E,0x0F,0x10,0x11,0x12,0x13,FAIL,/* 8 9 : ; < = > ? *//* 7*/0x14,0x15,DONE,FAIL,FAIL,FAIL,FAIL,FAIL,/* @ A B C D E F G *//* 8*/0x16,0x17,0x18,0x19,0x1A,0x1B,0x1C,0x1D,/* H I J K L M N O *//* 9*/0x1E,0x1F,0x20,0x21,0x22,0x23,0x24,FAIL,/* P Q R S T U V W *//*10*/0x25,0x26,0x27,0x28,0x29,0x2A,0x2B,FAIL,/* X Y Z [ \ ] ^ _ *//*11*/0x2C,0x2D,0x2E,0x2F,FAIL,FAIL,FAIL,FAIL,/* ` a b c d e f g *//*12*/0x30,0x31,0x32,0x33,0x34,0x35,0x36,FAIL,/* h i j k l m n o *//*13*/0x37,0x38,0x39,0x3A,0x3B,0x3C,FAIL,FAIL,/* p q r s t u v w *//*14*/0x3D,0x3E,0x3F,FAIL,FAIL,FAIL,FAIL,FAIL,/* x y z { | } ~ ^? *//*15*/FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,/*16*/FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,FAIL,};staticunsignedchartable_b2a_hqx[]="!\"#$%&'()*+,-012345689@ABCDEFGHIJKLMNPQRSTUVXYZ[`abcdefhijklmpqr";staticchartable_a2b_base64[]={-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,62,-1,-1,-1,63,52,53,54,55,56,57,58,59,60,61,-1,-1,-1,0,-1,-1,/* Note PAD->0 */-1,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,-1,-1,-1,-1,-1,-1,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,-1,-1,-1,-1,-1};#define BASE64_PAD '='/* Max binary chunk size; limited only by available memory */#define BASE64_MAXBIN ((PY_SSIZE_T_MAX - 3) / 2)staticunsignedchartable_b2a_base64[]="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";staticunsignedshortcrctab_hqx[256]={0x0000,0x1021,0x2042,0x3063,0x4084,0x50a5,0x60c6,0x70e7,0x8108,0x9129,0xa14a,0xb16b,0xc18c,0xd1ad,0xe1ce,0xf1ef,0x1231,0x0210,0x3273,0x2252,0x52b5,0x4294,0x72f7,0x62d6,0x9339,0x8318,0xb37b,0xa35a,0xd3bd,0xc39c,0xf3ff,0xe3de,0x2462,0x3443,0x0420,0x1401,0x64e6,0x74c7,0x44a4,0x5485,0xa56a,0xb54b,0x8528,0x9509,0xe5ee,0xf5cf,0xc5ac,0xd58d,0x3653,0x2672,0x1611,0x0630,0x76d7,0x66f6,0x5695,0x46b4,0xb75b,0xa77a,0x9719,0x8738,0xf7df,0xe7fe,0xd79d,0xc7bc,0x48c4,0x58e5,0x6886,0x78a7,0x0840,0x1861,0x2802,0x3823,0xc9cc,0xd9ed,0xe98e,0xf9af,0x8948,0x9969,0xa90a,0xb92b,0x5af5,0x4ad4,0x7ab7,0x6a96,0x1a71,0x0a50,0x3a33,0x2a12,0xdbfd,0xcbdc,0xfbbf,0xeb9e,0x9b79,0x8b58,0xbb3b,0xab1a,0x6ca6,0x7c87,0x4ce4,0x5cc5,0x2c22,0x3c03,0x0c60,0x1c41,0xedae,0xfd8f,0xcdec,0xddcd,0xad2a,0xbd0b,0x8d68,0x9d49,0x7e97,0x6eb6,0x5ed5,0x4ef4,0x3e13,0x2e32,0x1e51,0x0e70,0xff9f,0xefbe,0xdfdd,0xcffc,0xbf1b,0xaf3a,0x9f59,0x8f78,0x9188,0x81a9,0xb1ca,0xa1eb,0xd10c,0xc12d,0xf14e,0xe16f,0x1080,0x00a1,0x30c2,0x20e3,0x5004,0x4025,0x7046,0x6067,0x83b9,0x9398,0xa3fb,0xb3da,0xc33d,0xd31c,0xe37f,0xf35e,0x02b1,0x1290,0x22f3,0x32d2,0x4235,0x5214,0x6277,0x7256,0xb5ea,0xa5cb,0x95a8,0x8589,0xf56e,0xe54f,0xd52c,0xc50d,0x34e2,0x24c3,0x14a0,0x0481,0x7466,0x6447,0x5424,0x4405,0xa7db,0xb7fa,0x8799,0x97b8,0xe75f,0xf77e,0xc71d,0xd73c,0x26d3,0x36f2,0x0691,0x16b0,0x6657,0x7676,0x4615,0x5634,0xd94c,0xc96d,0xf90e,0xe92f,0x99c8,0x89e9,0xb98a,0xa9ab,0x5844,0x4865,0x7806,0x6827,0x18c0,0x08e1,0x3882,0x28a3,0xcb7d,0xdb5c,0xeb3f,0xfb1e,0x8bf9,0x9bd8,0xabbb,0xbb9a,0x4a75,0x5a54,0x6a37,0x7a16,0x0af1,0x1ad0,0x2ab3,0x3a92,0xfd2e,0xed0f,0xdd6c,0xcd4d,0xbdaa,0xad8b,0x9de8,0x8dc9,0x7c26,0x6c07,0x5c64,0x4c45,0x3ca2,0x2c83,0x1ce0,0x0cc1,0xef1f,0xff3e,0xcf5d,0xdf7c,0xaf9b,0xbfba,0x8fd9,0x9ff8,0x6e17,0x7e36,0x4e55,0x5e74,0x2e93,0x3eb2,0x0ed1,0x1ef0,};PyDoc_STRVAR(doc_a2b_uu,"(ascii) -> bin. Decode a line of uuencoded data");staticPyObject*binascii_a2b_uu(PyObject*self,PyObject*args){Py_bufferpascii;unsignedchar*ascii_data,*bin_data;intleftbits=0;unsignedcharthis_ch;unsignedintleftchar=0;PyObject*rv;Py_ssize_tascii_len,bin_len;if(!PyArg_ParseTuple(args,"y*:a2b_uu",&pascii))returnNULL;ascii_data=pascii.buf;ascii_len=pascii.len;assert(ascii_len>=0);/* First byte: binary data length (in bytes) */bin_len=(*ascii_data++-' ')&077;ascii_len--;/* Allocate the buffer */if((rv=PyBytes_FromStringAndSize(NULL,bin_len))==NULL){PyBuffer_Release(&pascii);returnNULL;}bin_data=(unsignedchar*)PyBytes_AS_STRING(rv);for(;bin_len>0;ascii_len--,ascii_data++){/* XXX is it really best to add NULs if there's no more data */this_ch=(ascii_len>0)?*ascii_data:0;if(this_ch=='\n'||this_ch=='\r'||ascii_len<=0){/* ** Whitespace. Assume some spaces got eaten at ** end-of-line. (We check this later) */this_ch=0;}else{/* Check the character for legality ** The 64 in stead of the expected 63 is because ** there are a few uuencodes out there that use ** '`' as zero instead of space. */if(this_ch<' '||this_ch>(' '+64)){PyErr_SetString(Error,"Illegal char");PyBuffer_Release(&pascii);Py_DECREF(rv);returnNULL;}this_ch=(this_ch-' ')&077;}/* ** Shift it in on the low end, and see if there's ** a byte ready for output. */leftchar=(leftchar<<6)|(this_ch);leftbits+=6;if(leftbits>=8){leftbits-=8;*bin_data++=(leftchar>>leftbits)&0xff;leftchar&=((1<<leftbits)-1);bin_len--;}}/* ** Finally, check that if there's anything left on the line ** that it's whitespace only. */while(ascii_len-->0){this_ch=*ascii_data++;/* Extra '`' may be written as padding in some cases */if(this_ch!=' '&&this_ch!=' '+64&&this_ch!='\n'&&this_ch!='\r'){PyErr_SetString(Error,"Trailing garbage");PyBuffer_Release(&pascii);Py_DECREF(rv);returnNULL;}}PyBuffer_Release(&pascii);returnrv;}PyDoc_STRVAR(doc_b2a_uu,"(bin) -> ascii. Uuencode line of data");staticPyObject*binascii_b2a_uu(PyObject*self,PyObject*args){Py_bufferpbin;unsignedchar*ascii_data,*bin_data;intleftbits=0;unsignedcharthis_ch;unsignedintleftchar=0;PyObject*rv;Py_ssize_tbin_len;if(!PyArg_ParseTuple(args,"y*:b2a_uu",&pbin))returnNULL;bin_data=pbin.buf;bin_len=pbin.len;if(bin_len>45){/* The 45 is a limit that appears in all uuencode's */PyErr_SetString(Error,"At most 45 bytes at once");PyBuffer_Release(&pbin);returnNULL;}/* We're lazy and allocate to much (fixed up later) */if((rv=PyBytes_FromStringAndSize(NULL,bin_len*2+2))==NULL){PyBuffer_Release(&pbin);returnNULL;}ascii_data=(unsignedchar*)PyBytes_AS_STRING(rv);/* Store the length */*ascii_data++=' '+(bin_len&077);for(;bin_len>0||leftbits!=0;bin_len--,bin_data++){/* Shift the data (or padding) into our buffer */if(bin_len>0)/* Data */leftchar=(leftchar<<8)|*bin_data;else/* Padding */leftchar<<=8;leftbits+=8;/* See if there are 6-bit groups ready */while(leftbits>=6){this_ch=(leftchar>>(leftbits-6))&0x3f;leftbits-=6;*ascii_data++=this_ch+' ';}}*ascii_data++='\n';/* Append a courtesy newline */if(_PyBytes_Resize(&rv,(ascii_data-(unsignedchar*)PyBytes_AS_STRING(rv)))<0){Py_DECREF(rv);rv=NULL;}PyBuffer_Release(&pbin);returnrv;}staticintbinascii_find_valid(unsignedchar*s,Py_ssize_tslen,intnum){/* Finds & returns the (num+1)th ** valid character for base64, or -1 if none. */intret=-1;unsignedcharc,b64val;while((slen>0)&&(ret==-1)){c=*s;b64val=table_a2b_base64[c&0x7f];if(((c<=0x7f)&&(b64val!=(unsignedchar)-1))){if(num==0)ret=*s;num--;}s++;slen--;}returnret;}PyDoc_STRVAR(doc_a2b_base64,"(ascii) -> bin. Decode a line of base64 data");staticPyObject*binascii_a2b_base64(PyObject*self,PyObject*args){Py_bufferpascii;unsignedchar*ascii_data,*bin_data;intleftbits=0;unsignedcharthis_ch;unsignedintleftchar=0;PyObject*rv;Py_ssize_tascii_len,bin_len;intquad_pos=0;if(!PyArg_ParseTuple(args,"y*:a2b_base64",&pascii))returnNULL;ascii_data=pascii.buf;ascii_len=pascii.len;assert(ascii_len>=0);if(ascii_len>PY_SSIZE_T_MAX-3){PyBuffer_Release(&pascii);returnPyErr_NoMemory();}bin_len=((ascii_len+3)/4)*3;/* Upper bound, corrected later *//* Allocate the buffer */if((rv=PyBytes_FromStringAndSize(NULL,bin_len))==NULL){PyBuffer_Release(&pascii);returnNULL;}bin_data=(unsignedchar*)PyBytes_AS_STRING(rv);bin_len=0;for(;ascii_len>0;ascii_len--,ascii_data++){this_ch=*ascii_data;if(this_ch>0x7f||this_ch=='\r'||this_ch=='\n'||this_ch==' ')continue;/* Check for pad sequences and ignore ** the invalid ones. */if(this_ch==BASE64_PAD){if((quad_pos<2)||((quad_pos==2)&&(binascii_find_valid(ascii_data,ascii_len,1)!=BASE64_PAD))){continue;}else{/* A pad sequence means no more input. ** We've already interpreted the data ** from the quad at this point. */leftbits=0;break;}}this_ch=table_a2b_base64[*ascii_data];if(this_ch==(unsignedchar)-1)continue;/* ** Shift it in on the low end, and see if there's ** a byte ready for output. */quad_pos=(quad_pos+1)&0x03;leftchar=(leftchar<<6)|(this_ch);leftbits+=6;if(leftbits>=8){leftbits-=8;*bin_data++=(leftchar>>leftbits)&0xff;bin_len++;leftchar&=((1<<leftbits)-1);}}if(leftbits!=0){PyBuffer_Release(&pascii);PyErr_SetString(Error,"Incorrect padding");Py_DECREF(rv);returnNULL;}/* And set string size correctly. If the result string is empty ** (because the input was all invalid) return the shared empty ** string instead; _PyBytes_Resize() won't do this for us. */if(bin_len>0){if(_PyBytes_Resize(&rv,bin_len)<0){Py_DECREF(rv);rv=NULL;}}else{Py_DECREF(rv);rv=PyBytes_FromStringAndSize("",0);}PyBuffer_Release(&pascii);returnrv;}PyDoc_STRVAR(doc_b2a_base64,"(bin) -> ascii. Base64-code line of data");staticPyObject*binascii_b2a_base64(PyObject*self,PyObject*args){Py_bufferpbuf;unsignedchar*ascii_data,*bin_data;intleftbits=0;unsignedcharthis_ch;unsignedintleftchar=0;PyObject*rv;Py_ssize_tbin_len;if(!PyArg_ParseTuple(args,"y*:b2a_base64",&pbuf))returnNULL;bin_data=pbuf.buf;bin_len=pbuf.len;assert(bin_len>=0);if(bin_len>BASE64_MAXBIN){PyErr_SetString(Error,"Too much data for base64 line");PyBuffer_Release(&pbuf);returnNULL;}/* We're lazy and allocate too much (fixed up later). "+3" leaves room for up to two pad characters and a trailing newline. Note that 'b' gets encoded as 'Yg==\n' (1 in, 5 out). */if((rv=PyBytes_FromStringAndSize(NULL,bin_len*2+3))==NULL){PyBuffer_Release(&pbuf);returnNULL;}ascii_data=(unsignedchar*)PyBytes_AS_STRING(rv);for(;bin_len>0;bin_len--,bin_data++){/* Shift the data into our buffer */leftchar=(leftchar<<8)|*bin_data;leftbits+=8;/* See if there are 6-bit groups ready */while(leftbits>=6){this_ch=(leftchar>>(leftbits-6))&0x3f;leftbits-=6;*ascii_data++=table_b2a_base64[this_ch];}}if(leftbits==2){*ascii_data++=table_b2a_base64[(leftchar&3)<<4];*ascii_data++=BASE64_PAD;*ascii_data++=BASE64_PAD;}elseif(leftbits==4){*ascii_data++=table_b2a_base64[(leftchar&0xf)<<2];*ascii_data++=BASE64_PAD;}*ascii_data++='\n';/* Append a courtesy newline */if(_PyBytes_Resize(&rv,(ascii_data-(unsignedchar*)PyBytes_AS_STRING(rv)))<0){Py_DECREF(rv);rv=NULL;}PyBuffer_Release(&pbuf);returnrv;}PyDoc_STRVAR(doc_a2b_hqx,"ascii -> bin, done. Decode .hqx coding");staticPyObject*binascii_a2b_hqx(PyObject*self,PyObject*args){unsignedchar*ascii_data,*bin_data;intleftbits=0;unsignedcharthis_ch;unsignedintleftchar=0;PyObject*rv;Py_ssize_tlen;intdone=0;if(!PyArg_ParseTuple(args,"t#:a2b_hqx",&ascii_data,&len))returnNULL;assert(len>=0);if(len>PY_SSIZE_T_MAX-2)returnPyErr_NoMemory();/* Allocate a string that is too big (fixed later) Add two to the initial length to prevent interning which would preclude subsequent resizing. */if((rv=PyBytes_FromStringAndSize(NULL,len+2))==NULL)returnNULL;bin_data=(unsignedchar*)PyBytes_AS_STRING(rv);for(;len>0;len--,ascii_data++){/* Get the byte and look it up */this_ch=table_a2b_hqx[*ascii_data];if(this_ch==SKIP)continue;if(this_ch==FAIL){PyErr_SetString(Error,"Illegal char");Py_DECREF(rv);returnNULL;}if(this_ch==DONE){/* The terminating colon */done=1;break;}/* Shift it into the buffer and see if any bytes are ready */leftchar=(leftchar<<6)|(this_ch);leftbits+=6;if(leftbits>=8){leftbits-=8;*bin_data++=(leftchar>>leftbits)&0xff;leftchar&=((1<<leftbits)-1);}}if(leftbits&&!done){PyErr_SetString(Incomplete,"String has incomplete number of bytes");Py_DECREF(rv);returnNULL;}if(_PyBytes_Resize(&rv,(bin_data-(unsignedchar*)PyBytes_AS_STRING(rv)))<0){Py_DECREF(rv);rv=NULL;}if(rv){PyObject*rrv=Py_BuildValue("Oi",rv,done);Py_DECREF(rv);returnrrv;}returnNULL;}PyDoc_STRVAR(doc_rlecode_hqx,"Binhex RLE-code binary data");staticPyObject*binascii_rlecode_hqx(PyObject*self,PyObject*args){Py_bufferpbuf;unsignedchar*in_data,*out_data;PyObject*rv;unsignedcharch;Py_ssize_tin,inend,len;if(!PyArg_ParseTuple(args,"y*:rlecode_hqx",&pbuf))returnNULL;in_data=pbuf.buf;len=pbuf.len;assert(len>=0);if(len>PY_SSIZE_T_MAX/2-2){PyBuffer_Release(&pbuf);returnPyErr_NoMemory();}/* Worst case: output is twice as big as input (fixed later) */if((rv=PyBytes_FromStringAndSize(NULL,len*2+2))==NULL){PyBuffer_Release(&pbuf);returnNULL;}out_data=(unsignedchar*)PyBytes_AS_STRING(rv);for(in=0;in<len;in++){ch=in_data[in];if(ch==RUNCHAR){/* RUNCHAR. Escape it. */*out_data++=RUNCHAR;*out_data++=0;}else{/* Check how many following are the same */for(inend=in+1;inend<len&&in_data[inend]==ch&&inend<in+255;inend++);if(inend-in>3){/* More than 3 in a row. Output RLE. */*out_data++=ch;*out_data++=RUNCHAR;*out_data++=inend-in;in=inend-1;}else{/* Less than 3. Output the byte itself */*out_data++=ch;}}}if(_PyBytes_Resize(&rv,(out_data-(unsignedchar*)PyBytes_AS_STRING(rv)))<0){Py_DECREF(rv);rv=NULL;}PyBuffer_Release(&pbuf);returnrv;}PyDoc_STRVAR(doc_b2a_hqx,"Encode .hqx data");staticPyObject*binascii_b2a_hqx(PyObject*self,PyObject*args){Py_bufferpbin;unsignedchar*ascii_data,*bin_data;intleftbits=0;unsignedcharthis_ch;unsignedintleftchar=0;PyObject*rv;Py_ssize_tlen;if(!PyArg_ParseTuple(args,"y*:b2a_hqx",&pbin))returnNULL;bin_data=pbin.buf;len=pbin.len;assert(len>=0);if(len>PY_SSIZE_T_MAX/2-2){PyBuffer_Release(&pbin);returnPyErr_NoMemory();}/* Allocate a buffer that is at least large enough */if((rv=PyBytes_FromStringAndSize(NULL,len*2+2))==NULL){PyBuffer_Release(&pbin);returnNULL;}ascii_data=(unsignedchar*)PyBytes_AS_STRING(rv);for(;len>0;len--,bin_data++){/* Shift into our buffer, and output any 6bits ready */leftchar=(leftchar<<8)|*bin_data;leftbits+=8;while(leftbits>=6){this_ch=(leftchar>>(leftbits-6))&0x3f;leftbits-=6;*ascii_data++=table_b2a_hqx[this_ch];}}/* Output a possible runt byte */if(leftbits){leftchar<<=(6-leftbits);*ascii_data++=table_b2a_hqx[leftchar&0x3f];}if(_PyBytes_Resize(&rv,(ascii_data-(unsignedchar*)PyBytes_AS_STRING(rv)))<0){Py_DECREF(rv);rv=NULL;}PyBuffer_Release(&pbin);returnrv;}PyDoc_STRVAR(doc_rledecode_hqx,"Decode hexbin RLE-coded string");staticPyObject*binascii_rledecode_hqx(PyObject*self,PyObject*args){Py_bufferpin;unsignedchar*in_data,*out_data;unsignedcharin_byte,in_repeat;PyObject*rv;Py_ssize_tin_len,out_len,out_len_left;if(!PyArg_ParseTuple(args,"s*:rledecode_hqx",&pin))returnNULL;in_data=pin.buf;in_len=pin.len;assert(in_len>=0);/* Empty string is a special case */if(in_len==0){PyBuffer_Release(&pin);returnPyBytes_FromStringAndSize("",0);}elseif(in_len>PY_SSIZE_T_MAX/2){PyBuffer_Release(&pin);returnPyErr_NoMemory();}/* Allocate a buffer of reasonable size. Resized when needed */out_len=in_len*2;if((rv=PyBytes_FromStringAndSize(NULL,out_len))==NULL){PyBuffer_Release(&pin);returnNULL;}out_len_left=out_len;out_data=(unsignedchar*)PyBytes_AS_STRING(rv);/* ** We need two macros here to get/put bytes and handle ** end-of-buffer for input and output strings. */#define INBYTE(b) \ do { \ if ( --in_len < 0 ) { \ PyErr_SetString(Incomplete, ""); \ Py_DECREF(rv); \ PyBuffer_Release(&pin); \ return NULL; \ } \ b = *in_data++; \ } while(0)#define OUTBYTE(b) \ do { \ if ( --out_len_left < 0 ) { \ if ( out_len > PY_SSIZE_T_MAX / 2) return PyErr_NoMemory(); \ if (_PyBytes_Resize(&rv, 2*out_len) < 0) \ { Py_DECREF(rv); PyBuffer_Release(&pin); return NULL; } \ out_data = (unsigned char *)PyBytes_AS_STRING(rv) \ + out_len; \ out_len_left = out_len-1; \ out_len = out_len * 2; \ } \ *out_data++ = b; \ } while(0)/* ** Handle first byte separately (since we have to get angry ** in case of an orphaned RLE code). */INBYTE(in_byte);if(in_byte==RUNCHAR){INBYTE(in_repeat);if(in_repeat!=0){/* Note Error, not Incomplete (which is at the end ** of the string only). This is a programmer error. */PyErr_SetString(Error,"Orphaned RLE code at start");PyBuffer_Release(&pin);Py_DECREF(rv);returnNULL;}OUTBYTE(RUNCHAR);}else{OUTBYTE(in_byte);}while(in_len>0){INBYTE(in_byte);if(in_byte==RUNCHAR){INBYTE(in_repeat);if(in_repeat==0){/* Just an escaped RUNCHAR value */OUTBYTE(RUNCHAR);}else{/* Pick up value and output a sequence of it */in_byte=out_data[-1];while(--in_repeat>0)OUTBYTE(in_byte);}}else{/* Normal byte */OUTBYTE(in_byte);}}if(_PyBytes_Resize(&rv,(out_data-(unsignedchar*)PyBytes_AS_STRING(rv)))<0){Py_DECREF(rv);rv=NULL;}PyBuffer_Release(&pin);returnrv;}PyDoc_STRVAR(doc_crc_hqx,"(data, oldcrc) -> newcrc. Compute hqx CRC incrementally");staticPyObject*binascii_crc_hqx(PyObject*self,PyObject*args){Py_bufferpin;unsignedchar*bin_data;unsignedintcrc;Py_ssize_tlen;if(!PyArg_ParseTuple(args,"y*i:crc_hqx",&pin,&crc))returnNULL;bin_data=pin.buf;len=pin.len;while(len-->0){crc=((crc<<8)&0xff00)^crctab_hqx[((crc>>8)&0xff)^*bin_data++];}PyBuffer_Release(&pin);returnPy_BuildValue("i",crc);}PyDoc_STRVAR(doc_crc32,"(data, oldcrc = 0) -> newcrc. Compute CRC-32 incrementally");#ifdef USE_ZLIB_CRC32/* This was taken from zlibmodule.c PyZlib_crc32 (but is PY_SSIZE_T_CLEAN) */staticPyObject*binascii_crc32(PyObject*self,PyObject*args){unsignedintcrc32val=0;/* crc32(0L, Z_NULL, 0) */Py_bufferpbuf;Byte*buf;Py_ssize_tlen;intsigned_val;if(!PyArg_ParseTuple(args,"y*|I:crc32",&pbuf,&crc32val))returnNULL;buf=(Byte*)pbuf.buf;len=pbuf.len;signed_val=crc32(crc32val,buf,len);PyBuffer_Release(&pbuf);returnPyLong_FromUnsignedLong(signed_val&0xffffffffU);}#else /* USE_ZLIB_CRC32 *//* Crc - 32 BIT ANSI X3.66 CRC checksum files Also known as: ISO 3307**********************************************************************|* *|* Demonstration program to compute the 32-bit CRC used as the frame *|* check sequence in ADCCP (ANSI X3.66, also known as FIPS PUB 71 *|* and FED-STD-1003, the U.S. versions of CCITT's X.25 link-level *|* protocol). The 32-bit FCS was added via the Federal Register, *|* 1 June 1982, p.23798. I presume but don't know for certain that *|* this polynomial is or will be included in CCITT V.41, which *|* defines the 16-bit CRC (often called CRC-CCITT) polynomial. FIPS *|* PUB 78 says that the 32-bit FCS reduces otherwise undetected *|* errors by a factor of 10^-5 over 16-bit FCS. *|* *|**********************************************************************| Copyright (C) 1986 Gary S. Brown. You may use this program, or code or tables extracted from it, as desired without restriction. First, the polynomial itself and its table of feedback terms. The polynomial is X^32+X^26+X^23+X^22+X^16+X^12+X^11+X^10+X^8+X^7+X^5+X^4+X^2+X^1+X^0 Note that we take it "backwards" and put the highest-order term in the lowest-order bit. The X^32 term is "implied"; the LSB is the X^31 term, etc. The X^0 term (usually shown as "+1") results in the MSB being 1. Note that the usual hardware shift register implementation, which is what we're using (we're merely optimizing it by doing eight-bit chunks at a time) shifts bits into the lowest-order term. In our implementation, that means shifting towards the right. Why do we do it this way? Because the calculated CRC must be transmitted in order from highest-order term to lowest-order term. UARTs transmit characters in order from LSB to MSB. By storing the CRC this way, we hand it to the UART in the order low-byte to high-byte; the UART sends each low-bit to hight-bit; and the result is transmission bit by bit from highest- to lowest-order term without requiring any bit shuffling on our part. Reception works similarly. The feedback terms table consists of 256, 32-bit entries. Notes: 1. The table can be generated at runtime if desired; code to do so is shown later. It might not be obvious, but the feedback terms simply represent the results of eight shift/xor opera- tions for all combinations of data and CRC register values. 2. The CRC accumulation logic is the same for all CRC polynomials, be they sixteen or thirty-two bits wide. You simply choose the appropriate table. Alternatively, because the table can be generated at runtime, you can start by generating the table for the polynomial in question and use exactly the same "updcrc", if your application needn't simultaneously handle two CRC polynomials. (Note, however, that XMODEM is strange.) 3. For 16-bit CRCs, the table entries need be only 16 bits wide; of course, 32-bit entries work OK if the high 16 bits are zero. 4. The values must be right-shifted by eight bits by the "updcrc" logic; the shift must be unsigned (bring in zeroes). On some hardware you could probably optimize the shift in assembler by using byte-swap instructions.********************************************************************/staticunsignedintcrc_32_tab[256]={0x00000000U,0x77073096U,0xee0e612cU,0x990951baU,0x076dc419U,0x706af48fU,0xe963a535U,0x9e6495a3U,0x0edb8832U,0x79dcb8a4U,0xe0d5e91eU,0x97d2d988U,0x09b64c2bU,0x7eb17cbdU,0xe7b82d07U,0x90bf1d91U,0x1db71064U,0x6ab020f2U,0xf3b97148U,0x84be41deU,0x1adad47dU,0x6ddde4ebU,0xf4d4b551U,0x83d385c7U,0x136c9856U,0x646ba8c0U,0xfd62f97aU,0x8a65c9ecU,0x14015c4fU,0x63066cd9U,0xfa0f3d63U,0x8d080df5U,0x3b6e20c8U,0x4c69105eU,0xd56041e4U,0xa2677172U,0x3c03e4d1U,0x4b04d447U,0xd20d85fdU,0xa50ab56bU,0x35b5a8faU,0x42b2986cU,0xdbbbc9d6U,0xacbcf940U,0x32d86ce3U,0x45df5c75U,0xdcd60dcfU,0xabd13d59U,0x26d930acU,0x51de003aU,0xc8d75180U,0xbfd06116U,0x21b4f4b5U,0x56b3c423U,0xcfba9599U,0xb8bda50fU,0x2802b89eU,0x5f058808U,0xc60cd9b2U,0xb10be924U,0x2f6f7c87U,0x58684c11U,0xc1611dabU,0xb6662d3dU,0x76dc4190U,0x01db7106U,0x98d220bcU,0xefd5102aU,0x71b18589U,0x06b6b51fU,0x9fbfe4a5U,0xe8b8d433U,0x7807c9a2U,0x0f00f934U,0x9609a88eU,0xe10e9818U,0x7f6a0dbbU,0x086d3d2dU,0x91646c97U,0xe6635c01U,0x6b6b51f4U,0x1c6c6162U,0x856530d8U,0xf262004eU,0x6c0695edU,0x1b01a57bU,0x8208f4c1U,0xf50fc457U,0x65b0d9c6U,0x12b7e950U,0x8bbeb8eaU,0xfcb9887cU,0x62dd1ddfU,0x15da2d49U,0x8cd37cf3U,0xfbd44c65U,0x4db26158U,0x3ab551ceU,0xa3bc0074U,0xd4bb30e2U,0x4adfa541U,0x3dd895d7U,0xa4d1c46dU,0xd3d6f4fbU,0x4369e96aU,0x346ed9fcU,0xad678846U,0xda60b8d0U,0x44042d73U,0x33031de5U,0xaa0a4c5fU,0xdd0d7cc9U,0x5005713cU,0x270241aaU,0xbe0b1010U,0xc90c2086U,0x5768b525U,0x206f85b3U,0xb966d409U,0xce61e49fU,0x5edef90eU,0x29d9c998U,0xb0d09822U,0xc7d7a8b4U,0x59b33d17U,0x2eb40d81U,0xb7bd5c3bU,0xc0ba6cadU,0xedb88320U,0x9abfb3b6U,0x03b6e20cU,0x74b1d29aU,0xead54739U,0x9dd277afU,0x04db2615U,0x73dc1683U,0xe3630b12U,0x94643b84U,0x0d6d6a3eU,0x7a6a5aa8U,0xe40ecf0bU,0x9309ff9dU,0x0a00ae27U,0x7d079eb1U,0xf00f9344U,0x8708a3d2U,0x1e01f268U,0x6906c2feU,0xf762575dU,0x806567cbU,0x196c3671U,0x6e6b06e7U,0xfed41b76U,0x89d32be0U,0x10da7a5aU,0x67dd4accU,0xf9b9df6fU,0x8ebeeff9U,0x17b7be43U,0x60b08ed5U,0xd6d6a3e8U,0xa1d1937eU,0x38d8c2c4U,0x4fdff252U,0xd1bb67f1U,0xa6bc5767U,0x3fb506ddU,0x48b2364bU,0xd80d2bdaU,0xaf0a1b4cU,0x36034af6U,0x41047a60U,0xdf60efc3U,0xa867df55U,0x316e8eefU,0x4669be79U,0xcb61b38cU,0xbc66831aU,0x256fd2a0U,0x5268e236U,0xcc0c7795U,0xbb0b4703U,0x220216b9U,0x5505262fU,0xc5ba3bbeU,0xb2bd0b28U,0x2bb45a92U,0x5cb36a04U,0xc2d7ffa7U,0xb5d0cf31U,0x2cd99e8bU,0x5bdeae1dU,0x9b64c2b0U,0xec63f226U,0x756aa39cU,0x026d930aU,0x9c0906a9U,0xeb0e363fU,0x72076785U,0x05005713U,0x95bf4a82U,0xe2b87a14U,0x7bb12baeU,0x0cb61b38U,0x92d28e9bU,0xe5d5be0dU,0x7cdcefb7U,0x0bdbdf21U,0x86d3d2d4U,0xf1d4e242U,0x68ddb3f8U,0x1fda836eU,0x81be16cdU,0xf6b9265bU,0x6fb077e1U,0x18b74777U,0x88085ae6U,0xff0f6a70U,0x66063bcaU,0x11010b5cU,0x8f659effU,0xf862ae69U,0x616bffd3U,0x166ccf45U,0xa00ae278U,0xd70dd2eeU,0x4e048354U,0x3903b3c2U,0xa7672661U,0xd06016f7U,0x4969474dU,0x3e6e77dbU,0xaed16a4aU,0xd9d65adcU,0x40df0b66U,0x37d83bf0U,0xa9bcae53U,0xdebb9ec5U,0x47b2cf7fU,0x30b5ffe9U,0xbdbdf21cU,0xcabac28aU,0x53b39330U,0x24b4a3a6U,0xbad03605U,0xcdd70693U,0x54de5729U,0x23d967bfU,0xb3667a2eU,0xc4614ab8U,0x5d681b02U,0x2a6f2b94U,0xb40bbe37U,0xc30c8ea1U,0x5a05df1bU,0x2d02ef8dU};staticPyObject*binascii_crc32(PyObject*self,PyObject*args){/* By Jim Ahlstrom; All rights transferred to CNRI */Py_bufferpbin;unsignedchar*bin_data;unsignedintcrc=0;/* initial value of CRC */Py_ssize_tlen;unsignedintresult;if(!PyArg_ParseTuple(args,"y*|I:crc32",&pbin,&crc))returnNULL;bin_data=pbin.buf;len=pbin.len;crc=~crc;while(len-->0){crc=crc_32_tab[(crc^*bin_data++)&0xff]^(crc>>8);/* Note: (crc >> 8) MUST zero fill on left */}result=(crc^0xFFFFFFFF);PyBuffer_Release(&pbin);returnPyLong_FromUnsignedLong(result&0xffffffff);}#endif /* USE_ZLIB_CRC32 */staticPyObject*binascii_hexlify(PyObject*self,PyObject*args){Py_bufferparg;char*argbuf;Py_ssize_targlen;PyObject*retval;char*retbuf;Py_ssize_ti,j;if(!PyArg_ParseTuple(args,"y*:b2a_hex",&parg))returnNULL;argbuf=parg.buf;arglen=parg.len;assert(arglen>=0);if(arglen>PY_SSIZE_T_MAX/2){PyBuffer_Release(&parg);returnPyErr_NoMemory();}retval=PyBytes_FromStringAndSize(NULL,arglen*2);if(!retval){PyBuffer_Release(&parg);returnNULL;}retbuf=PyBytes_AS_STRING(retval);/* make hex version of string, taken from shamodule.c */for(i=j=0;i<arglen;i++){charc;c=(argbuf[i]>>4)&0xf;c=(c>9)?c+'a'-10:c+'0';retbuf[j++]=c;c=argbuf[i]&0xf;c=(c>9)?c+'a'-10:c+'0';retbuf[j++]=c;}PyBuffer_Release(&parg);returnretval;}PyDoc_STRVAR(doc_hexlify,"b2a_hex(data) -> s; Hexadecimal representation of binary data.\n\\n\This function is also available as \"hexlify()\".");staticintto_int(intc){if(isdigit(c))returnc-'0';else{if(isupper(c))c=tolower(c);if(c>='a'&&c<='f')returnc-'a'+10;}return-1;}staticPyObject*binascii_unhexlify(PyObject*self,PyObject*args){Py_bufferparg;char*argbuf;Py_ssize_targlen;PyObject*retval;char*retbuf;Py_ssize_ti,j;if(!PyArg_ParseTuple(args,"s*:a2b_hex",&parg))returnNULL;argbuf=parg.buf;arglen=parg.len;assert(arglen>=0);/* XXX What should we do about strings with an odd length? Should * we add an implicit leading zero, or a trailing zero? For now, * raise an exception. */if(arglen%2){PyBuffer_Release(&parg);PyErr_SetString(Error,"Odd-length string");returnNULL;}retval=PyBytes_FromStringAndSize(NULL,(arglen/2));if(!retval){PyBuffer_Release(&parg);returnNULL;}retbuf=PyBytes_AS_STRING(retval);for(i=j=0;i<arglen;i+=2){inttop=to_int(Py_CHARMASK(argbuf[i]));intbot=to_int(Py_CHARMASK(argbuf[i+1]));if(top==-1||bot==-1){PyErr_SetString(Error,"Non-hexadecimal digit found");gotofinally;}retbuf[j++]=(top<<4)+bot;}PyBuffer_Release(&parg);returnretval;finally:PyBuffer_Release(&parg);Py_DECREF(retval);returnNULL;}PyDoc_STRVAR(doc_unhexlify,"a2b_hex(hexstr) -> s; Binary data of hexadecimal representation.\n\\n\hexstr must contain an even number of hex digits (upper or lower case).\n\This function is also available as \"unhexlify()\"");staticinttable_hex[128]={-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,0,1,2,3,4,5,6,7,8,9,-1,-1,-1,-1,-1,-1,-1,10,11,12,13,14,15,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,10,11,12,13,14,15,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1};#define hexval(c) table_hex[(unsigned int)(c)]#define MAXLINESIZE 76PyDoc_STRVAR(doc_a2b_qp,"Decode a string of qp-encoded data");staticPyObject*binascii_a2b_qp(PyObject*self,PyObject*args,PyObject*kwargs){Py_ssize_tin,out;charch;Py_bufferpdata;unsignedchar*data,*odata;Py_ssize_tdatalen=0;PyObject*rv;staticchar*kwlist[]={"data","header",NULL};intheader=0;if(!PyArg_ParseTupleAndKeywords(args,kwargs,"s*|i",kwlist,&pdata,&header))returnNULL;data=pdata.buf;datalen=pdata.len;/* We allocate the output same size as input, this is overkill. * The previous implementation used calloc() so we'll zero out the * memory here too, since PyMem_Malloc() does not guarantee that. */odata=(unsignedchar*)PyMem_Malloc(datalen);if(odata==NULL){PyBuffer_Release(&pdata);PyErr_NoMemory();returnNULL;}memset(odata,0,datalen);in=out=0;while(in<datalen){if(data[in]=='='){in++;if(in>=datalen)break;/* Soft line breaks */if((data[in]=='\n')||(data[in]=='\r')){if(data[in]!='\n'){while(in<datalen&&data[in]!='\n')in++;}if(in<datalen)in++;}elseif(data[in]=='='){/* broken case from broken python qp */odata[out++]='=';in++;}elseif(((data[in]>='A'&&data[in]<='F')||(data[in]>='a'&&data[in]<='f')||(data[in]>='0'&&data[in]<='9'))&&((data[in+1]>='A'&&data[in+1]<='F')||(data[in+1]>='a'&&data[in+1]<='f')||(data[in+1]>='0'&&data[in+1]<='9'))){/* hexval */ch=hexval(data[in])<<4;in++;ch|=hexval(data[in]);in++;odata[out++]=ch;}else{odata[out++]='=';}}elseif(header&&data[in]=='_'){odata[out++]=' ';in++;}else{odata[out]=data[in];in++;out++;}}if((rv=PyBytes_FromStringAndSize((char*)odata,out))==NULL){PyBuffer_Release(&pdata);PyMem_Free(odata);returnNULL;}PyBuffer_Release(&pdata);PyMem_Free(odata);returnrv;}staticintto_hex(unsignedcharch,unsignedchar*s){unsignedintuvalue=ch;s[1]="0123456789ABCDEF"[uvalue%16];uvalue=(uvalue/16);s[0]="0123456789ABCDEF"[uvalue%16];return0;}PyDoc_STRVAR(doc_b2a_qp,"b2a_qp(data, quotetabs=0, istext=1, header=0) -> s; \n\ Encode a string using quoted-printable encoding. \n\\n\On encoding, when istext is set, newlines are not encoded, and white \n\space at end of lines is. When istext is not set, \\r and \\n (CR/LF) are \n\both encoded. When quotetabs is set, space and tabs are encoded.");/* XXX: This is ridiculously complicated to be backward compatible * (mostly) with the quopri module. It doesn't re-create the quopri * module bug where text ending in CRLF has the CR encoded */staticPyObject*binascii_b2a_qp(PyObject*self,PyObject*args,PyObject*kwargs){Py_ssize_tin,out;Py_bufferpdata;unsignedchar*data,*odata;Py_ssize_tdatalen=0,odatalen=0;PyObject*rv;unsignedintlinelen=0;staticchar*kwlist[]={"data","quotetabs","istext","header",NULL};intistext=1;intquotetabs=0;intheader=0;unsignedcharch;intcrlf=0;unsignedchar*p;if(!PyArg_ParseTupleAndKeywords(args,kwargs,"y*|iii",kwlist,&pdata,&quotetabs,&istext,&header))returnNULL;data=pdata.buf;datalen=pdata.len;/* See if this string is using CRLF line ends *//* XXX: this function has the side effect of converting all of * the end of lines to be the same depending on this detection * here */p=(unsignedchar*)memchr(data,'\n',datalen);if((p!=NULL)&&(p>data)&&(*(p-1)=='\r'))crlf=1;/* First, scan to see how many characters need to be encoded */in=0;while(in<datalen){if((data[in]>126)||(data[in]=='=')||(header&&data[in]=='_')||((data[in]=='.')&&(linelen==0)&&(data[in+1]=='\n'||data[in+1]=='\r'||data[in+1]==0))||(!istext&&((data[in]=='\r')||(data[in]=='\n')))||((data[in]=='\t'||data[in]==' ')&&(in+1==datalen))||((data[in]<33)&&(data[in]!='\r')&&(data[in]!='\n')&&(quotetabs||(!quotetabs&&((data[in]!='\t')&&(data[in]!=' ')))))){if((linelen+3)>=MAXLINESIZE){linelen=0;if(crlf)odatalen+=3;elseodatalen+=2;}linelen+=3;odatalen+=3;in++;}else{if(istext&&((data[in]=='\n')||((in+1<datalen)&&(data[in]=='\r')&&(data[in+1]=='\n')))){linelen=0;/* Protect against whitespace on end of line */if(in&&((data[in-1]==' ')||(data[in-1]=='\t')))odatalen+=2;if(crlf)odatalen+=2;elseodatalen+=1;if(data[in]=='\r')in+=2;elsein++;}else{if((in+1!=datalen)&&(data[in+1]!='\n')&&(linelen+1)>=MAXLINESIZE){linelen=0;if(crlf)odatalen+=3;elseodatalen+=2;}linelen++;odatalen++;in++;}}}/* We allocate the output same size as input, this is overkill. * The previous implementation used calloc() so we'll zero out the * memory here too, since PyMem_Malloc() does not guarantee that. */odata=(unsignedchar*)PyMem_Malloc(odatalen);if(odata==NULL){PyBuffer_Release(&pdata);PyErr_NoMemory();returnNULL;}memset(odata,0,odatalen);in=out=linelen=0;while(in<datalen){if((data[in]>126)||(data[in]=='=')||(header&&data[in]=='_')||((data[in]=='.')&&(linelen==0)&&(data[in+1]=='\n'||data[in+1]=='\r'||data[in+1]==0))||(!istext&&((data[in]=='\r')||(data[in]=='\n')))||((data[in]=='\t'||data[in]==' ')&&(in+1==datalen))||((data[in]<33)&&(data[in]!='\r')&&(data[in]!='\n')&&(quotetabs||(!quotetabs&&((data[in]!='\t')&&(data[in]!=' ')))))){if((linelen+3)>=MAXLINESIZE){odata[out++]='=';if(crlf)odata[out++]='\r';odata[out++]='\n';linelen=0;}odata[out++]='=';to_hex(data[in],&odata[out]);out+=2;in++;linelen+=3;}else{if(istext&&((data[in]=='\n')||((in+1<datalen)&&(data[in]=='\r')&&(data[in+1]=='\n')))){linelen=0;/* Protect against whitespace on end of line */if(out&&((odata[out-1]==' ')||(odata[out-1]=='\t'))){ch=odata[out-1];odata[out-1]='=';to_hex(ch,&odata[out]);out+=2;}if(crlf)odata[out++]='\r';odata[out++]='\n';if(data[in]=='\r')in+=2;elsein++;}else{if((in+1!=datalen)&&(data[in+1]!='\n')&&(linelen+1)>=MAXLINESIZE){odata[out++]='=';if(crlf)odata[out++]='\r';odata[out++]='\n';linelen=0;}linelen++;if(header&&data[in]==' '){odata[out++]='_';in++;}else{odata[out++]=data[in++];}}}}if((rv=PyBytes_FromStringAndSize((char*)odata,out))==NULL){PyBuffer_Release(&pdata);PyMem_Free(odata);returnNULL;}PyBuffer_Release(&pdata);PyMem_Free(odata);returnrv;}/* List of functions defined in the module */staticstructPyMethodDefbinascii_module_methods[]={{"a2b_uu",binascii_a2b_uu,METH_VARARGS,doc_a2b_uu},{"b2a_uu",binascii_b2a_uu,METH_VARARGS,doc_b2a_uu},{"a2b_base64",binascii_a2b_base64,METH_VARARGS,doc_a2b_base64},{"b2a_base64",binascii_b2a_base64,METH_VARARGS,doc_b2a_base64},{"a2b_hqx",binascii_a2b_hqx,METH_VARARGS,doc_a2b_hqx},{"b2a_hqx",binascii_b2a_hqx,METH_VARARGS,doc_b2a_hqx},{"b2a_hex",binascii_hexlify,METH_VARARGS,doc_hexlify},{"a2b_hex",binascii_unhexlify,METH_VARARGS,doc_unhexlify},{"hexlify",binascii_hexlify,METH_VARARGS,doc_hexlify},{"unhexlify",binascii_unhexlify,METH_VARARGS,doc_unhexlify},{"rlecode_hqx",binascii_rlecode_hqx,METH_VARARGS,doc_rlecode_hqx},{"rledecode_hqx",binascii_rledecode_hqx,METH_VARARGS,doc_rledecode_hqx},{"crc_hqx",binascii_crc_hqx,METH_VARARGS,doc_crc_hqx},{"crc32",binascii_crc32,METH_VARARGS,doc_crc32},{"a2b_qp",(PyCFunction)binascii_a2b_qp,METH_VARARGS|METH_KEYWORDS,doc_a2b_qp},{"b2a_qp",(PyCFunction)binascii_b2a_qp,METH_VARARGS|METH_KEYWORDS,doc_b2a_qp},{NULL,NULL}/* sentinel */};/* Initialization function for the module (*must* be called PyInit_binascii) */PyDoc_STRVAR(doc_binascii,"Conversion between binary data and ASCII");staticstructPyModuleDefbinasciimodule={PyModuleDef_HEAD_INIT,"binascii",doc_binascii,-1,binascii_module_methods,NULL,NULL,NULL,NULL};PyMODINIT_FUNCPyInit_binascii(void){PyObject*m,*d;/* Create the module and add the functions */m=PyModule_Create(&binasciimodule);if(m==NULL)returnNULL;d=PyModule_GetDict(m);Error=PyErr_NewException("binascii.Error",PyExc_ValueError,NULL);PyDict_SetItemString(d,"Error",Error);Incomplete=PyErr_NewException("binascii.Incomplete",NULL,NULL);PyDict_SetItemString(d,"Incomplete",Incomplete);if(PyErr_Occurred()){Py_DECREF(m);m=NULL;}returnm;}